From 2b9e22071524f8ce503b118693c9e36164f4e76f Mon Sep 17 00:00:00 2001
From: Rudy Celekli <47457359+rudycelekli@users.noreply.github.com>
Date: Fri, 2 Oct 2026 23:09:32 -0400
Subject: [PATCH] fix(inventory): keep discrete EOQ positive for low demand

Signed-off-by: Rudy Celekli <47457359+rudycelekli@users.noreply.github.com>
---
 specialized/supply-chain-strategist.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/specialized/supply-chain-strategist.md b/specialized/supply-chain-strategist.md
index f3b52086..b2dc5bfb 100644
--- a/specialized/supply-chain-strategist.md
+++ b/specialized/supply-chain-strategist.md
@@ -88,10 +88,14 @@ class InventoryManager:
         EOQ = sqrt(2 * D * S / H)
         """
         d = self.params.annual_demand
+        if d <= 0:
+            raise ValueError("Discrete-unit EOQ requires positive annual demand")
         s = self.params.order_cost
         h = self.params.unit_price * self.params.holding_cost_rate
         eoq = np.sqrt(2 * d * s / h)
-        return round(eoq)
+        # This discrete-unit example must order at least one unit when demand
+        # is positive; rounding a small EOQ to zero breaks the annual report.
+        return max(1, round(eoq))
 
     def calculate_safety_stock(self) -> float:
         """